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开展致密储层物性上限研究对明确研究区油气成藏机理及分布规律具有重要帮助。应用临界喉道半径探讨了吐哈盆地水西沟群斜坡带致密储层物性上限问题。临界喉道半径的求取需要对孔隙与喉道半径比、润湿角、油水或气水密度差等关键参数进行确定,利用恒速压汞实验、润湿性分析、PVT等实验对上述关键参数进行了拟合。结果表明:研究区的孔隙与喉道半径比约为90,润湿角约为20.48°;致密储层物性上限随着地层倾角的增大而减小,且致密气储层物性上限比致密油更加严格;研究区的地层倾角约为15°,此条件下致密油储层和致密气储层的临界喉道半径分别为0.552μm和0.491μm,相应致密油储层物性上限是8.43%和0.378×10~(-3)μm~2,致密气储层物性上限是8.39%和0.358×10~(-3)μm~2。
It is of great help to clarify the hydrocarbon accumulation mechanism and distribution in the study area. By using the critical throat radius, the upper limit of the physical properties of the tight reservoirs in the Shuihaigou Group in the Tuha Basin is discussed. The critical throat radius needs to determine the key parameters such as pore-to-throat radius ratio, wetting angle, oil-water or gas-water density difference. By using the experiments of constant pressure mercury intrusion, wettability analysis and PVT, The parameters were fitted. The results show that the ratio of pore to throat radius is about 90 and the wetting angle is about 20.48 ° in the study area. The upper limit of tight reservoir properties decreases with the increase of dip angle, and the upper bound of tightness of tight gas reservoirs is higher than that of tight oil The critical throat radius of tight oil reservoirs and tight gas reservoirs are 0.552μm and 0.491μm, respectively. The corresponding upper limit of physical properties of tight oil reservoirs is 8.43% and 0.378 × 10 ~ (-3) μm ~ 2, the upper limit of tight gas reservoir is 8.39% and 0.358 × 10 ~ (-3) μm ~ 2.